JP3963645B2 - Disk rotation drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk rotation driving apparatus that rotates various disks such as a CD, a DVD, and a magneto-optical disk, and more particularly to a disk rotation driving apparatus that can self-chuck a disk without providing a clamper.
[0002]
[Prior art]
Some disk rotation driving devices that clamp a disk such as a CD include a turntable and a clamper that presses the disk against the turntable. However, since this disk rotation drive device rotates the disk with the disk held between the turntable and the clamper, the overall thickness becomes large, and the clamper must be removed when the disk is introduced and ejected. Since a space for separating from the turntable is necessary, there is a limit to cope with the thinning of the equipment.
[0003]
Therefore, there is a so-called self-chucking type in which a disk holding means is provided on the turntable. This self-chucking type turntable is provided with a pressurizing body such as a spherical shape or a nail shape at the center protruding portion, and this pressurizing body is elastically pressed to the center hole of the disc, The disc is held on the turntable.
[0004]
[Problems to be solved by the invention]
In the disk rotation driving device having the self-chucking type turntable, when the disk is installed on the turntable, it is necessary to force the disk to be pressed against the turntable, and when the disk is detached from the turntable. It is necessary to forcibly remove the disk from the disk holding means.
[0005]
Therefore, in a disk apparatus that mounts and removes a disk by hand operation, a strong force is required to press the disk against the turntable and remove the disk, and the mounting / removing operation is complicated.
[0006]
In addition, in the auto loading type disk device in which the disk is fed by means such as a roller in the housing, the self-chucking type turntable is used, and a pressing mechanism for pressing the disk against the turntable in the housing, It is necessary to provide a detaching mechanism for detaching the disk from the turntable, and the structure inside the housing becomes extremely complicated.
[0007]
The present invention solves the above-described conventional problems, and provides a disk rotation drive device that uses a self-chucking table without a clamper, and that allows the disk to be easily attached to and detached from the table. The purpose is to do.
[0008]
[Means for Solving the Problems]
The present invention includes a drive shaft that is rotationally driven, a table that rotates integrally with the drive shaft and supports the lower surface of the disk, and a holding member that is rotatably supported by the table and holds the disk by the table. A drive body provided rotatably with respect to the drive shaft, a brake member provided rotatably with respect to the drive shaft, a spring member that press-contacts the brake member with the drive body, A restraining member that imparts restraining force to the braking member;
The drive shaft and the table rotate between the drive body and the holding member in a state where the restraint member restrains the brake member and a braking force is applied from the brake member to the drive body. In this case, there is provided connecting means for rotating the holding member from a holding position for holding the disk to a retreat position located in the center hole of the disk.
[0009]
In the disk rotation driving device of the present invention, when the table is rotated in either direction while applying a braking force to the driving body, the disk can be held by the table and the holding member, and the table is rotated in the opposite direction. Then, the holding of the disk by the holding member can be released.
[0011]
For example, the restraining member is a moving base that moves along the disk by mounting a head that performs at least one of reading and writing, and when the moving base moves to the inner peripheral side of the disk, The braking member is restrained.
[0012]
However, the braking means may apply a braking force to the driving body by directly pressing the moving base or another restraining member against the driving body (first plate).
[0013]
Moreover, the connecting means is a pin provided on the drive member, when the table is rotated in a state braking force to the driving member from the braking member is al provided, the retention on said table The member is rotated to the retracted position by the pin. Alternatively, it is possible to provide a structure in which a link mechanism or a cam mechanism is provided between the driving body and the holding member, and the holding member is rotated by the driving body.
[0014]
Moreover, it is preferable that the said holding member is urged | biased so that it may turn toward the said holding position with a spring.
[0015]
When the holding member is biased to the holding position, the holding member is always located at the holding position when the table is rotated by releasing the braking force to the driving body, and the holding of the disk is stabilized.
[0016]
In this case, a brake means for applying a braking force to the table when the table rotates and the holding member rotates to the retracted position in a state where a braking force is applied from the braking member to the driving body. Is preferably provided.
[0017]
For example, the brake means is a control unit that generates a braking force in a motor that drives the drive shaft.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
[0019]
FIG. 1 is an external perspective view showing a disk rotation drive device according to the present invention, FIG. 2 is an exploded perspective view of the disk rotation drive device, FIG. 3 is a plan view of the disk rotation drive device, and FIG. B) shows the disc holding release state. FIG. 4 is a side view showing the disk rotation driving device and the head mechanism.
[0020]
As shown in FIGS. 1 and 2, the disk rotation driving device 1 is composed of a rotary table 10, a disk holding mechanism 20, a braking means 30, and a drive motor M having a drive shaft M1.
[0021]
The turntable 10 is formed of a synthetic resin material or a nonmagnetic metal material, and a protrusion 11 inserted into the center hole D1 of the disk D is provided at the center. A flange portion 12 is integrally formed around the base end, and a disc receiving portion 13 for receiving the surface of the disc D is formed on the upper surface of the outer peripheral portion of the flange portion 12.
[0022]
A shaft hole 14 is formed at the center of the protrusion 11. The shaft hole 14 is inserted into and fixed to the tip of the drive shaft M1 of the drive motor M by means such as press fitting. Accordingly, when rotation is given to the drive shaft M1, the rotary table 10 rotates together.
[0023]
Openings 15, 15, 15 are formed on the circumferential side surface of the protrusion 11 at every angle equally divided in the circumferential direction (in this embodiment, every 120 degrees). In addition, in the protrusion 11, convex support shafts 16, 16, 16 extending from the flange portion 12 of the rotary table 10 at every angle equally divided in the circumferential direction, and the flange portion 12 are plate-thick. Long holes 17, 17, 17 penetrating in the direction are provided (see FIG. 3).
[0024]
The disk holding mechanism 20 includes a holding member 21 and an urging member 22. The holding member 21 is formed of a synthetic resin material or the like, and includes a holding claw 21a, a hole 21b serving as a rotation fulcrum, and a locking portion 21c. The holding member 21 is rotatably supported so that the hole 21 b is extrapolated to the support shaft 16 and the holding claw 21 a can protrude from the opening 15. The holding claw 21a has a width dimension W that is sufficiently smaller than the opening width dimension of the opening 15 so that it can protrude and retract within the gap of the opening 15. The state in which the holding claw 21a protrudes from the opening 15 is a holding position where the disk D can be held. When the holding claw 21a retracts into the protrusion 11, the center hole D1 of the disk D Regression position located inside.
[0025]
The urging member 22 is made of, for example, a torsion coil spring or the like, and includes a winding portion 22c wound in a coil shape and latching arms 22a and 22b extending from both ends thereof. A winding portion 22 c of the urging member 22 is extrapolated to the support shaft 16 and is positioned below the holding member 21. One latching arm 22a of the urging member 22 is latched on the inner peripheral wall surface of the protrusion 11, the other latching arm 22b is latched on a part of the holding member 21, and the holding claw 21a is The holding member 21 is always urged in a direction protruding to the outside of the opening 15.
[0026]
The braking means 30 is provided on the lower side of the disk holding mechanism 20 and is pressed against each other between the first plate 31 (driving body) and the first plate 31 via a frictional resistance. And a second plate (braking member) 32.
[0027]
The first plate 31 has a ring shape, and a drive shaft M1 is inserted through a center hole 31a thereof. The first plate 31 is in a relation of being freely rotatable with respect to the drive shaft M1. On the upper surface of the first plate 31, switching pins 31b, 31b, 31b serving as connecting members are integrally fixed at every angle equally divided in the circumferential direction (in this embodiment, every 120 degrees). The tip of the switching pin 31b in the Z1 direction shown in the figure is inserted through the long hole 17 formed in the region of the protrusion 11 of the rotary table 10, and the rotary table 10 and the first plate 31 are inserted. Is relatively movable, the switching pin 31b is movable in the circumferential direction (in the directions α1 and α2 in the figure) inside the long hole 17.
[0028]
The second plate 32 has a concave shape, and a through hole 32a is formed at the center of the bottom surface. The drive shaft M1 of the drive motor M is inserted through the through hole 32a, and the second plate 32 can freely rotate with respect to the drive shaft M1.
[0029]
The first plate 31 does not move in the axial direction by a ring or the like fitted to the drive shaft M1, and is rotatable with respect to the drive shaft M1. Further, a ring (not shown) is fitted to the lower end of the drive shaft M1, and a compression coil spring is provided between the ring and the second plate 32, so that the second plate 32 is always biased upward. The bottom surface of the concave portion of the second plate is always in pressure contact with the first plate 31.
[0030]
Between the bottom surface of the first plate 31 and the top surface of the second plate 32, there is provided sliding means for generating a frictional resistance force in the rotational direction (in the directions α1 and α2 in the drawing). Therefore, when an external force is not applied to the second plate 32, the first plate 31 and the second plate 32 rotate as one body, and a restraining force is applied to the second plate to When it is rotated, slip occurs between the first plate 31 that rotates together with the turntable 10 and the second plate 32 that receives the restraining force.
[0031]
A bearing member is provided in the center hole 31a of the first plate 31 and the through hole 32a of the second plate 32, and the first plate 31 and the second plate 32 can freely move around the drive shaft M1 by the bearing member. It may be possible to rotate.
[0032]
The restraining member that gives restraining force to the second plate 32 can be configured by a lever, a slider, or the like that fits the second plate 32 or pressurizes the second plate 32, and a head mechanism is used as the restraining member. It is possible to use.
[0033]
In the example shown in FIG. 4, a head mechanism 50 is provided in the vicinity of the disk rotation driving device 1. The head mechanism 50 is configured such that a moving base 51 supported between a pair of guide shafts 52 provided in parallel is movable in the radial direction of the disk D by receiving a transfer force such as a screw shaft (not shown). ing. On the moving base 51, an optical head or a magneto-optical head having an objective lens 53 is provided, and data is recorded on the disk D placed on the rotary table 10 or data recorded on the disk D is recorded. Reading is possible. In the head mechanism 50, a part of the moving base 51 is moved to the innermost position (position closest to the drive shaft M1) by moving the moving base 51 serving as a restraining member to the second plate 32. The second plate 32 can be constrained by abutting on the outer peripheral surface of the plate or by fitting the concave and convex portions.
[0034]
The braking means 30 may be anything as long as it applies a braking force to the first plate 31. For example, the second plate 32 is not provided, and a restraining member such as a moving base 51 is provided. A sliding friction member such as a leaf spring or felt attached to the first plate 31 may be directly pressed against the outer peripheral side surface of the first plate 31 so that a braking force is applied to the first plate 31.
[0035]
As shown in FIG. 2, the disk device on which the disk rotation drive device 1 is mounted is provided with a control unit 61 and a mounting detection means 62. The control unit 61 controls the rotation speed and rotation direction of the motor, and also controls the brake current that gives a braking force to the rotor of the motor and the head mechanism 50. The mounting detection means 62 moves to the turntable 10. The presence / absence of attachment / detachment of the disk D is detected.
[0036]
The operation of the disk rotation driving device will be described.
(Operation before loading a disc)
As shown in FIG. 3A, when the disk D is not placed on the turntable 10, that is, when the disk rotation driving device 1 is in the non-driven state, the other latching arm 22b of the urging member 22 is The holding member 21 is urged in the illustrated β1 (counterclockwise) direction. For this reason, the switching pin 31b is pressed in the illustrated β1 (counterclockwise) direction by the locking portion 21c of the holding member 21 and is positioned at the terminal portion of one of the long holes 17 in the rotational direction (the illustrated α1 direction: clockwise direction). . Therefore, the holding member 21 is set at a holding position where the holding claw 21 a protrudes from the opening 15 of the protrusion 11. That is, when the disk rotation drive device 1 is in a non-driven state, the disk D cannot be loaded on the turntable 10.
[0037]
(Operation when loading a disc)
For example, when the disk device on which the disk rotation driving device 1 is mounted is an auto loading type, when the disk D is inserted into the entrance / exit of the disk device, the control unit 61 causes the disk transport means (FIG. 5). The disk D is transported to a position above the rotary table 10.
[0038]
While the disk is being conveyed, the control base 61 moves the moving base 51 of the head mechanism 50 to the innermost peripheral position, the moving base 51 comes into contact with the second plate 32, and The second plate 32 is restrained. Since the second plate 32 is pressed against the first plate 31 with a spring, the first plate 31 is also restrained at this point.
[0039]
Then, as shown in FIG. 3B, a drive current is given to the drive motor M by the controller 61, and the drive shaft M1 is rotated in the α1 direction (clockwise direction) in the figure. Since the braking force is applied to the first plate 31 and the first plate 31 stays at the initial stage of the rotation, the switching pin 31b is stopped when the rotary table 10 rotates clockwise. In this state, the holding member 21 moves in the α1 direction shown in the figure. Accordingly, the holding member 21 is rotated in the β2 direction by the switching pin 31b, and the holding claw 21a moves into the protrusion 11 and is set at the retracted position. Thereafter, the first plate 31 rotates together with the rotary table 10, and slip occurs between the second plate 32 and the first plate 31 that are restrained by the moving base 51. Therefore, the overvoltage applied to the drive motor M can be made extremely small as compared with the case where the first plate 31 is directly restrained.
[0040]
When the rotary table 10 rotates by a slight angle, that is, an angle sufficient for the holding claw 21a to retract, a brake current is applied to the drive motor M, and a brake is applied to the drive shaft M1 and the rotary table 10. Thus, the rotation of the drive shaft M1 is stopped, and the drive shaft M1 is held so as not to rotate by the brake force of the motor. On the other hand, since the second plate 32 continues to be restrained by the moving base 51, even if a biasing force is applied from the biasing member 22 to the holding member 21, the biasing force causes the first plate 31 to move. On the other hand, the rotary table 10 does not inadvertently idle in the α1 direction, and the retracting posture of the holding member 21 shown in FIG. 3B is maintained.
[0041]
In the state shown in FIG. 3B, the center hole D1 of the disk D is externally inserted into the protrusion 11 and placed on the disk receiving portion 13. The mounting detector 62 detects that the disk D is placed on the rotary table 10.
[0042]
When the control unit 61 recognizes the disk mounting state by the detection of the mounting detection means 62, the drive motor M is started by the control of the control unit 61 while the moving base 51 restrains the second plate 32. The drive shaft M1 and the rotary table 10 are reversed in the α2 direction. Also at this time, slippage occurs between the second plate 32 and the first plate 31, and the long hole 17 rotates in the α2 direction with respect to the switching pin 31b. As a result, the holding member 21 is forcibly rotated counterclockwise (β1 direction) by the switching pin 31b, and the periphery of the center hole D1 of the disk D protrudes from the opening 15 of the protrusion 11 to the outside. It is clamped between the claw 21a and the rotary table 10.
[0043]
Thereafter, the moving base 51 moves in the outer circumferential direction of the disk, and the restraining force on the second plate 32 is released. Then, the drive motor M is driven in the α1 direction, and the rotary table 10 is rotated in the clockwise direction (α1 direction). At this time, since the holding member 21 is stabilized at the holding position by the urging member 22, the holding of the disk D is maintained. The disk D is rotated in the α1 direction together with the rotary table 10. At this time, the first plate 31 and the second plate 32, which are in a free state, rotate together in the α1 direction.
[0044]
Then, the control unit 61 moves the moving base 51 in the radial direction of the disk D, and reads data information on the disk D and writes data to the disk D.
[0045]
(Operation when the disc is detached)
When a stop button provided on the disk device is pressed, the drive motor M stops and the disk D is held while being held on the rotary table 10. Further, when an eject button (not shown) for ejecting the disc is pressed, the moving base 51 is moved to the innermost peripheral position by the control unit 61 and comes into contact with the second plate 32, so that the second plate A restraining force is given to 32. Then, the rotary table 10 is rotated in the α1 direction by the drive motor M, slip occurs between the first plate 31 and the second plate 32, and the holding member 21 moves in the α1 direction with respect to the switching pin 31b. by moving the holding member 21 is rotated in the β2 direction, it is set to regress position as shown in Figure 3 (B). At this time as well, the brake motor is applied to the drive motor M, so that the state of FIG.
[0046]
Since the holding claw 21a of the holding member 21 is retracted into the center hole D1 of the disc D, the holding of the disc D is released. Thereafter, the disc D is lifted from the rotary table 10 and discharged by the disc transport means. Is done.
[0047]
FIG. 5 shows a configuration example of a disk device provided with the disk rotation driving device.
[0048]
The disk device shown in FIG. 5 is an auto loading type (slot-in type), and an insertion / discharge port 70 a is opened on the front surface of the housing 70. The disk rotation driving device 1 is installed inside the housing 70. Transfer rollers 71 and 72 are provided inside the insertion / discharge port 70a, and a resin guide pad 73 is fixed above the transfer rollers 71 and 72.
[0049]
When the disc D is inserted from the insertion / discharge port 70a with the transfer rollers 71 and 72 moving upward, the disc D is sandwiched between the transfer rollers 71 and 72 and the guide pad 73, and one of the transfer rollers It is transferred to the back side of the housing 70 by the rotational force of 71. In other words, the transfer rollers 71 and 72 and the guide pad 73 constitute a disk transport means.
[0050]
The transferred disk D is positioned by a positioning member (not shown) when the center hole D1 moves to a position facing the protrusion 11 of the disk rotation driving device 1. At this time, the transfer rollers 71 and 72 are lowered, the center hole D1 of the disk D is inserted into the protrusion 11, and the disk D is set on the disk receiving part 13.
[0051]
When the mounting detection means 62 detects that the disk D is installed on the disk receiving portion 13, the drive shaft M 1 is started and the disk D is held on the rotary table 10 by the holding member 21. .
[0052]
Further, the disk rotation driving device 1 of the present invention may be one in which any one of a plurality of disks is selected and transferred and transferred onto the rotary table 10.
[0053]
【The invention's effect】
According to the present invention described in detail above, it is possible to hold the disk on the table and to release the holding only by applying a braking force to the driving body (first plate) and rotating the table. Therefore, the disk can be held and released from the table easily and reliably without a clamper.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing an embodiment of a disk rotation driving device of the present invention,
FIG. 2 is an exploded perspective view of a disk rotation drive device;
FIGS. 3A and 3B are plan views of a disk rotation driving device, in which FIG. 3A shows a disk holding state, and FIG. 3B shows a disk holding release state;
FIG. 4 is a side view showing a disk rotation driving device and a head mechanism;
FIG. 5 is a diagram showing a configuration example of a disk device provided with a disk rotation driving device;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disc rotation drive device 10 Rotary table 11 Protrusion part 15 Opening part 16 Support shaft 17 Long hole 20 Disc holding mechanism 21 Holding member 21a Holding claw 22 Energizing member 30 Braking means 31 1st plate (driving body)
31b Switching pin 32 Second plate (braking member)
50 Head mechanism 51 Moving base (restraint member)
61 Controller D Disk M Drive motor M1 Drive shaft

Claims (7)

A drive shaft that is rotationally driven; a table that rotates integrally with the drive shaft to support the lower surface of the disk; a holding member that is rotatably supported by the table and holds the disk by the table; and the drive A drive member provided rotatably with respect to a shaft, a brake member provided rotatably with respect to the drive shaft, a spring member that press-contacts the brake member with the drive member, and the brake member A restraining member for imparting restraining force,
The drive shaft and the table rotate between the drive body and the holding member in a state where the restraint member restrains the brake member and a braking force is applied from the brake member to the drive body. And a connecting means for rotating the holding member from a holding position for holding the disk to a retracted position located in the center hole of the disk. When the table is further rotated after the table is rotated and the holding member is rotated to the retracted position in a state in which a braking force is applied from the brake member to the drive body, The disk rotation drive device according to claim 1, wherein slip occurs between the brake member and the brake member. The restraining member is a moving base that mounts a head that performs at least one of reading and writing and moves along the disk. When the moving base moves to the inner peripheral side of the disk, the moving base moves the brake. disk rotating apparatus according to claim 1 or 2 wherein members is restrained. It said connecting means is a pin provided on the drive member, when the table is rotated in a state braking force to the driving member from the braking member is al provided, the retaining member on said table 4. The disk rotation drive device according to claim 1, wherein the disk rotation drive device is rotated to the retracted position by the pin. The disk rotation driving device according to claim 1, wherein the holding member is biased toward the holding position by a spring. Brake means is provided for applying a braking force to the table when the table rotates and the holding member rotates to the retracted position in a state where a braking force is applied from the braking member to the driving body. The disk rotation driving device according to claim 5.   7. The disk rotation driving device according to claim 6, wherein the brake means is a control unit that generates a braking force to a motor that drives the drive shaft.

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